[Remix] 0 songs reported after selecting playlist which has had tracks deleted from the filesystem

[Jamie Strandboge]

1) Make a playlist with multiple tracks eg 1, 2, 3, 2, 3
2) Optionally close the app
3) Delete track 2 from the device
4) Start the app if you closed it
5) Open the playlist and notice that no tracks are shown and the count is 0

[Original Description]
I created a playlist called 'car' using the old music-app. It had 369 songs in it. After upgrading to the remix, I select Playlist from the upper left. I see my 'car' playlist and it says '369 songs'. I tap the playlist to play something, and it reports '0 songs'. Tapping 'play all' doesn't do anything.

The logs showed this at the time I selected the playlist:
qml: called LibraryListModel::filterPlaylist()
qml: {"count":369,"name":"Car"}
D-Bus error: "Could not get thumbnail"
D-Bus error: "Could not get thumbnail"
qml: called LibraryListModel::filterPlaylistTracks()
D-Bus error: "Could not get thumbnail"

[Andrew Hayzen (ahayzen)]

We believe this is due to a track that existed in a playlist being removed from the device.

[Ubuntu Phone Apps Jenkins Bot (ubuntu-phone-apps-jenkins-bot)]

Fix committed into lp:music-app/remix at revision 737, scheduled for release in music-app, milestone music-app-14.10-week-40

[Jamie Strandboge (jdstrand)]

I can confirm this patch fixes the issue for me.